Western Security Bank is a full service, community focused organization serving those who live and work in Yellowstone County, Montana. With conveniently located branches from Laurel to Lockwood, we offer more locations than any other financial institution serving the Billings area. Western Security Bank, A Division of Glacier Bank, takes pride providing our friends and neighbors with the security and trust necessary to form solid banking relationships. For those who still enjoy personalized service and highly trained bank personnel, Western Security Bank is the best hometown banking option. Division of Glacier Bank. Equal Housing Lender. Member FDIC.